723
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 968
- Proper Divisor Sum (Aliquot Sum)
- 245
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 480
- Möbius Function
- 1
- Radical
- 723
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 46
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Names
- German
- siebenhundertdreiundzwanzig· ordinal: siebenhundertdreiundzwanzigste
- English
- seven hundred twenty-three· ordinal: seven hundred twenty-third
- Spanish
- setecientos veintitrés· ordinal: 723º
- French
- sept cent vingt-trois· ordinal: sept cent vingt-troisième
- Italian
- settecentoventitre· ordinal: 723º
- Latin
- septingenti viginti tres· ordinal: 723.
- Portuguese
- setecentos e vinte e três· ordinal: 723º
Appears in sequences
- Number of twin prime pairs < square of n-th prime.at n=48A000885
- a(n) = 3 * prime(n).at n=52A001748
- Number of restricted solid partitions of n.at n=12A002974
- Numbers that are the sum of 4 nonzero 4th powers.at n=35A003338
- Divisors of 2^24 - 1.at n=32A003532
- Divisors of 2^48 - 1.at n=38A003553
- Add 4, then reverse digits; start with 0.at n=21A003608
- Sums of distinct nonzero 4th powers.at n=22A003999
- Divisible only by primes congruent to 3 mod 7.at n=43A004621
- Add 8, then reverse digits!.at n=24A007399
- a(n) is the largest odd number k such that 9, 11, ..., k are sums of 3 of first n odd primes.at n=51A007962
- Coordination sequence T10 for Zeolite Code EUO.at n=17A008096
- If a, b in sequence, so is ab+5.at n=14A009304
- Coordination sequence T2 for Keatite.at n=15A009845
- Coordination sequence T2 for Zeolite Code -CLO.at n=24A009851
- Coordination sequence T2 for Zeolite Code -PAR.at n=19A009856
- Coordination sequence T4 for Zeolite Code -PAR.at n=19A009858
- Coordination sequence T4 for Zeolite Code CON.at n=19A009871
- Smallest positive number that can be written as sum of distinct Fibonacci numbers in n ways.at n=24A013583
- Discriminants of imaginary quadratic fields with class number 4 (negated).at n=38A013658